One small detail: I don't get a 3520 listing for printing either in Sylpheed/Geany. There are only:

Print to File
Print to LPR

However, clicking on Print to LPR will send email or text file to the 3520

If TextMaker is used, then "Default Printer Queue [System]" will send doc to printer. In the print menu, TextMaker says the command is "lpr -r %" which does seem connected to similar commands in Sylpheed/Geany.

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